Evidence of Chemical Change

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into new substances with different properties.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is evidence of a chemical change?

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Evidence of a chemical change includes the formation of a gas, formation of a precipitate, color change, temperature change, and production of light.

Tags

NGSS.MS-PS1-2

Front

What does the formation of a gas indicate in a chemical reaction?

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The formation of a gas indicates that a chemical reaction has occurred, often resulting in new substances being produced.

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NGSS.MS-PS1-2

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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NGSS.MS-PS1-2

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What is an example of a temperature change indicating a chemical reaction?

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An example is when a reaction releases heat, causing the temperature of the surroundings to increase.

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NGSS.MS-PS1-2

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What does a color change signify in a chemical reaction?

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A color change can signify that a new substance has formed, indicating a chemical change.

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NGSS.MS-PS1-2

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What is the difference between a physical change and a chemical change?

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A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

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NGSS.MS-PS1-2

Front

What is the significance of the equation CaCO₃(s) → CaO(s) + CO₂(g)?

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This equation shows that calcium carbonate decomposes into calcium oxide and carbon dioxide, indicating a chemical change with gas formation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a chemical reaction that produces light?

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An example is the combustion of certain materials, such as fireworks, which produce light as a result of a chemical reaction.

Tags

NGSS.MS-PS1-2

Front

What does it mean if a reaction produces a precipitate?

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It means that a solid has formed from the reaction of two liquids, indicating a chemical change.

Tags

NGSS.MS-PS1-2